Rotary liquid pump



Sept. 4, 1928.y 1,683,010 l J. M.ANDERSON .ROTARY LIQUID PUMP Filed Aug. 17, 1927 y/ f j.

I I I Ill lill /4 I I 75 I I ,sa i

I I I H Patented Sept. 4, 1928.

UNITED STATES JOSEPH M. ANDERSON,

OF ELKO, MINNESOTA.

ROTARY LIQUID PUMP.

Application l'ed August 17, 19a?. serial No. 213,521.--

This invention relates to rotary liquid pumps and particularly to such pumps as can be used in connection with internal combustion engines for pumping the oil or water therein. The invention relates more particu larly to centainfimprovements on that class of pumps disclosed in the U. S. patent of 'Alexander T. Brown, No. 1,359,472, dated November 16, 1920. In thevBrown pump a lo casing for a rotatable screw is provided, having a chamber adjacent the top thereof of greater diameter than the diameter of the 4 screw and the shaft carrying the screw has a ortion extending through the said cham- 16 bei of approximately the same diameter as the diameter et ,the screw. With such a structure the liquid forced` into` the said chamber must be turned from its natural direction of flowage, sidewardly into the chamber, thereby creating a considerable back pressure and lessening the efficiency of the pum It is the main object of this invention to provide a rotary liquid pump including a 95 hollow casing, a screw working within ther opening in the casing, having comparatively wide edges closely abutting the side walls of the opening, a chamber at the top of the casing of equal diameter with the diameter of im the screw and into which the liquid discharged from the upper end of thev screw is adapted to be led so that no back pressure will be created to interfere with the efficient action of the screw.

A further object of the invention is to provide in such a. structure a double action screw whereby liquid can be discharged from 'the pump in great volume at high `constant pressure.

These and other objects and advantages of the present invention will more fully appear from the following description made in con'- nection with the accompanying drawings, wherein like reference characters refer to the .45 same or similar parts throughout the various views, and in which l,

Fig. 1 is a vie-w in side elevation .of the device, with certain of the parts broken away and shown in section;

Fig. 2 is a horizontal section taken on the y line 2-2 'of Fig. 1, asindicated by the arl l l rows; and

Fig. 3 is a view in side elevation showing a modified type of screw.

Referring to the drawings, a cylindrical casing 4 is provided, having a closed top 5 through the top 5 of the casing wherein it is ljournaled, and through the bore in the casing. Immediately below the top 5 the shaft 6 is provided with a flange 7 which closely abuts the top to seal the bearing therein. Below the iiange 7 the shaft 6 is of greater diameter th an half the diameter of the bore of the casing, and is provided with two sets of screw threads 8 which extend. from the lower end of the casing to adjacent the upper end of the bore, but which terminate short of the upper end of the boreto form a chamber 9 between the iange 7 and the upper ends of the screw threads. The screw threads 8 are quite wide at their edges and the diameter of the screw threads are such that the wide edges closely abut the side walls ofthe bore in the casing. A discharge rconduit 10 is threaded :in a bossed opening at the upper portion of. the casing so that the conduit will communicate directly with the chamber 9. An outwardly extending ange 11 is provided at the lower end of the casing 4 and a strainer 12 fitting over the lower open end of the casing` is secured to the liange 11 by means of bolts13 passing through the flange and through a ring 14 placed beneath the strainer 12. The strainer 12 preferably has a bellied portion extending downwardly below the opening at the lower end of the casing 4. The shaft 6 extends upwardly from the top 5 of the casing some little distance and a gear 15 or other operating means may be secured to the upper end of the shaft as by means of the set screw 16. Preferably the Y shaft 6, fiange 7.. and screw threads 8 will be turned from a single piece of material.

In Fig. 3 of the drawings, a screw member 17 is illustrated, which may be substituted for the screw member formed by the shaft 6, flange 7 and screw threads 8 in Fig. 1. The screw member 17 is similar to the said member illustrated in Fig. 1, with the exception that instead of having double screw threads thereon, the member 1 7 is provided with the Single screw threads 18.

i lIn operation the pump will be so situatedA `that the lower end of the casing 4 will be submerged in the liquid to be pumped. As the gear 15 is operated through any source of llU I power, the shaft k6- will be turned, thereby the casin and as the causing the screws8 to rapidly rotate to carry up the liquid from the lower end of the casin to the chamber 9 from whence the liquid wi l be discharged through the pipe 10. Inasmuch as the screw threads 8 terminate short of the upper end of the bore of vthe casing, liquid will be continuously supplied to the chamber 9, thereby causing a steady and continuous discharge of liquid -through the conduit 10. Inasmuchv as the screws 8 have comparativelywide edges which tightly abut the side walls of the bore, the pump will be veryeicient in its action and will force up the liquid into the chamber 9 at considerable pressure, there being no back leakage of liquid between the sides of the serew`threads and the sidewalls of the casing. The liquid will be forced directly into thejchambef'r) without changing the' direction of flow `of the same, so that practically no back pressure will be caused by whateverliquid there may be in chamber 9. TheA portion of shaft 6 extending through the bore in the casing 4 bef ing of at least half the diameter of the diaml eter of the bore, will act to cause the liquid toI follow the circuitous path formed by the screw threads 8 to prevent the liquid from being forced upwardly in the casing 4 at tool steep an an le.l The flange 7 will prevent any leakage of iquid through the upper end of ange forms .the t walls of c amber 9 and rotates with the sha 6, it will assist in causing a continuous cir- Y culation of liquid from the chamber 9 to conduit 10.

By provision of the double screw threads 8, a pump is provided which will be quicker in action and will discharge more liquid at a higher pressure than is the case where a single thread screw 18 is used. Also, by provision of the double thread screwliquid will be discharged in the chamber 9 at diametri-A cally opposite points therein, so that the direction of the circulation of liquid in chamber 9 to conduit-10 will alwaysremain the same and the discharge of li uid into the chamber 9 will ,be balanced at dliametrically opposite points therein, so that a more constant pres-l sure will be obtained in the dischar ing liquid. When the single screw 18 is su tituted for the double screws 8, the action of the two devices will lbe the same except for the differences above noted. It. will be understood that the pitch of the screws'and the spacin between convolutions thereof can be varied as desired. The particular type of strainer construction at the bottom of the leasing 4 may be varied as desired. It will also be ter shown and described and set forth in the appended claims.

What is claimed is-zy 1. A rotaryv liquid pump comprising a cylindrical casinghaving a closed up/per end and an open lower end adapted to be sub' merged in liquid, a screw journaled in'said upper end and extending through said casing, said screw having screw threads closely engaging the walls of said casing, said screw threads extending from the lower end of said casing toadjacent the top thereof but ter minating some distance from the top to form a small chamber at the upper end of said casing, said casing having a discharge outlet extending laterally from said chamber, means for rotating said screw and a flange carried by said screw, rotating "therewith, abutting the upper end oct saidv casing and Vbeing of substantially the same diameter as the interior ldiameter of said casing, said flange sealing the bearing for said screw, having a close running fit with the top and internal wall of said casing andforming a rotatable top wall for said chamber in one continuous plane whereby friction of the liquid a ainst the top of said casing isvprevente 2. A rotary liquid pump comprising a cylindrical casing having a closed upper end and an open lower end adapted to be submerged in liquid, a rotatable shaft journaled` in the Vclosed end of said casing and extending through the hollow portion thereof, a double thread screw carried by said shaft and engagingv the inner wall of said causing, said screw extending from the lower end of said casing to adjacent the upper portion thereof and having wide screw threads terminating in a horizontal plane ad'acent the top of said` casing, forming a cham er adjacent the top of said casing, a conduit extending laterally` from said chamber and casing, and means carried by. said shaft rotating therewith,

having a lower flat .annular surface, having a close running fit with said casing and forming the top of said chamber, whereby said chamber and conduit are disposed between rotating portions of said screw, and friction of the liquid against a stationary end of said casing is prevented.

In testimony whereof /I affix my signature.

JOSEPH M. ANDERSON. 

